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sig sauer 556 swat recoil spring

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    I see that Top Gun Supply lists two Sig Sauer 556 parts kits. One says for "M4 style" and the other says "Short Gas System, Swiss Style Stock." My rifle is a 556 SWAT with the full length gas tube. Is the "M4 style" parts kit correct for the full length gas tube? Also, I have seen where Wolff...
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